Is desynth dead?

[Elamys]

They pretty much stopped adding new unique items to desynth starting from HW. No higher grade demis after Field III and Master I. No more primal demis. No exclusive glamors from fish desynth any more.

So raising your desynth skill beyond ARR level now only provides materials that can be obtained outside of desynthesis, and the same existing demi types as lower level desynth.

I still try to cap mine each patch just for, I don't know, ocd raising the bars and possibility that something rewarding may come up eventually.

Leveling your desynth beyond 100 and on more than one class also has a benefit in that you have more stuff you can obtain without much effort for desynth, like old gear.